Why aren't my texts displaying after the other persons text?

I have an LG optimus L70. The other persons strand of messages are first and behind all of their strand of messages is my strand of messages and it builds up over time so i have to scroll all the way back up to where that message popped up to display to remember what i said. I'm jnust wondering how come it isn't one after the other like it was before, this just started happening too